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IABSD.fr/xenocara/lib/libdrm/tests/util/pattern.c

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  • Author : jsg
    Date : 2021-07-05 11:04:36
    Hash : 6af6d1f0
    Message : Import libdrm 2.4.107

  • lib/libdrm/tests/util/pattern.c
  • /*
     * Copyright 2008 Tungsten Graphics
     *   Jakob Bornecrantz <jakob@tungstengraphics.com>
     * Copyright 2008 Intel Corporation
     *   Jesse Barnes <jesse.barnes@intel.com>
     *
     * Permission is hereby granted, free of charge, to any person obtaining a
     * copy of this software and associated documentation files (the "Software"),
     * to deal in the Software without restriction, including without limitation
     * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     * and/or sell copies of the Software, and to permit persons to whom the
     * Software is furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     * IN THE SOFTWARE.
     */
    
    #include <stdint.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    
    #include <drm_fourcc.h>
    
    #if HAVE_CAIRO
    #include <cairo.h>
    #include <math.h>
    #endif
    
    #include "common.h"
    #include "format.h"
    #include "pattern.h"
    
    struct color_rgb24 {
    	unsigned int value:24;
    } __attribute__((__packed__));
    
    struct color_yuv {
    	unsigned char y;
    	unsigned char u;
    	unsigned char v;
    };
    
    #define MAKE_YUV_601_Y(r, g, b) \
    	((( 66 * (r) + 129 * (g) +  25 * (b) + 128) >> 8) + 16)
    #define MAKE_YUV_601_U(r, g, b) \
    	(((-38 * (r) -  74 * (g) + 112 * (b) + 128) >> 8) + 128)
    #define MAKE_YUV_601_V(r, g, b) \
    	(((112 * (r) -  94 * (g) -  18 * (b) + 128) >> 8) + 128)
    
    #define MAKE_YUV_601(r, g, b) \
    	{ .y = MAKE_YUV_601_Y(r, g, b), \
    	  .u = MAKE_YUV_601_U(r, g, b), \
    	  .v = MAKE_YUV_601_V(r, g, b) }
    
    /* This function takes 8-bit color values */
    static inline uint32_t shiftcolor8(const struct util_color_component *comp,
    				  uint32_t value)
    {
    	value &= 0xff;
    	/* Fill the low bits with the high bits. */
    	value = (value << 8) | value;
    	/* Shift down to remove unwanted low bits */
    	value = value >> (16 - comp->length);
    	/* Shift back up to where the value should be */
    	return value << comp->offset;
    }
    
    /* This function takes 10-bit color values */
    static inline uint32_t shiftcolor10(const struct util_color_component *comp,
    				    uint32_t value)
    {
    	value &= 0x3ff;
    	/* Fill the low bits with the high bits. */
    	value = (value << 6) | (value >> 4);
    	/* Shift down to remove unwanted low bits */
    	value = value >> (16 - comp->length);
    	/* Shift back up to where the value should be */
    	return value << comp->offset;
    }
    
    /* This function takes 16-bit color values */
    static inline uint64_t shiftcolor16(const struct util_color_component *comp,
    				    uint64_t value)
    {
    	value &= 0xffff;
    	/* Shift down to remove unwanted low bits */
    	value = value >> (16 - comp->length);
    	/* Shift back up to where the value should be */
    	return value << comp->offset;
    }
    
    #define MAKE_RGBA10(rgb, r, g, b, a) \
    	(shiftcolor10(&(rgb)->red, (r)) | \
    	 shiftcolor10(&(rgb)->green, (g)) | \
    	 shiftcolor10(&(rgb)->blue, (b)) | \
    	 shiftcolor10(&(rgb)->alpha, (a)))
    
    #define MAKE_RGBA(rgb, r, g, b, a) \
    	(shiftcolor8(&(rgb)->red, (r)) | \
    	 shiftcolor8(&(rgb)->green, (g)) | \
    	 shiftcolor8(&(rgb)->blue, (b)) | \
    	 shiftcolor8(&(rgb)->alpha, (a)))
    
    #define MAKE_RGB24(rgb, r, g, b) \
    	{ .value = MAKE_RGBA(rgb, r, g, b, 0) }
    
    
    /**
      * Takes a uint16_t, divides by 65536, converts the infinite-precision
      * result to fp16 with round-to-zero.
      *
      * Copied from mesa:src/util/half_float.c
      */
    static uint16_t uint16_div_64k_to_half(uint16_t v)
    {
    	/* Zero or subnormal. Set the mantissa to (v << 8) and return. */
    	if (v < 4)
    		return v << 8;
    
    	/* Count the leading 0s in the uint16_t */
    	int n = __builtin_clz(v) - 16;
    
    	/* Shift the mantissa up so bit 16 is the hidden 1 bit,
    	 * mask it off, then shift back down to 10 bits
    	 */
    	int m = ( ((uint32_t)v << (n + 1)) & 0xffff ) >> 6;
    
    	/*  (0{n} 1 X{15-n}) * 2^-16
    	 * = 1.X * 2^(15-n-16)
    	 * = 1.X * 2^(14-n - 15)
    	 * which is the FP16 form with e = 14 - n
    	 */
    	int e = 14 - n;
    
    	return (e << 10) | m;
    }
    
    #define MAKE_RGBA8FP16(rgb, r, g, b, a) \
    	(shiftcolor16(&(rgb)->red, uint16_div_64k_to_half((r) << 8)) | \
    	 shiftcolor16(&(rgb)->green, uint16_div_64k_to_half((g) << 8)) | \
    	 shiftcolor16(&(rgb)->blue, uint16_div_64k_to_half((b) << 8)) | \
    	 shiftcolor16(&(rgb)->alpha, uint16_div_64k_to_half((a) << 8)))
    
    #define MAKE_RGBA10FP16(rgb, r, g, b, a) \
    	(shiftcolor16(&(rgb)->red, uint16_div_64k_to_half((r) << 6)) | \
    	 shiftcolor16(&(rgb)->green, uint16_div_64k_to_half((g) << 6)) | \
    	 shiftcolor16(&(rgb)->blue, uint16_div_64k_to_half((b) << 6)) | \
    	 shiftcolor16(&(rgb)->alpha, uint16_div_64k_to_half((a) << 6)))
    
    static void fill_smpte_yuv_planar(const struct util_yuv_info *yuv,
    				  unsigned char *y_mem, unsigned char *u_mem,
    				  unsigned char *v_mem, unsigned int width,
    				  unsigned int height, unsigned int stride)
    {
    	const struct color_yuv colors_top[] = {
    		MAKE_YUV_601(191, 192, 192),	/* grey */
    		MAKE_YUV_601(192, 192, 0),	/* yellow */
    		MAKE_YUV_601(0, 192, 192),	/* cyan */
    		MAKE_YUV_601(0, 192, 0),	/* green */
    		MAKE_YUV_601(192, 0, 192),	/* magenta */
    		MAKE_YUV_601(192, 0, 0),	/* red */
    		MAKE_YUV_601(0, 0, 192),	/* blue */
    	};
    	const struct color_yuv colors_middle[] = {
    		MAKE_YUV_601(0, 0, 192),	/* blue */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    		MAKE_YUV_601(192, 0, 192),	/* magenta */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    		MAKE_YUV_601(0, 192, 192),	/* cyan */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    		MAKE_YUV_601(192, 192, 192),	/* grey */
    	};
    	const struct color_yuv colors_bottom[] = {
    		MAKE_YUV_601(0, 33, 76),	/* in-phase */
    		MAKE_YUV_601(255, 255, 255),	/* super white */
    		MAKE_YUV_601(50, 0, 106),	/* quadrature */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    		MAKE_YUV_601(9, 9, 9),		/* 3.5% */
    		MAKE_YUV_601(19, 19, 19),	/* 7.5% */
    		MAKE_YUV_601(29, 29, 29),	/* 11.5% */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    	};
    	unsigned int cs = yuv->chroma_stride;
    	unsigned int xsub = yuv->xsub;
    	unsigned int ysub = yuv->ysub;
    	unsigned int x;
    	unsigned int y;
    
    	/* Luma */
    	for (y = 0; y < height * 6 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			y_mem[x] = colors_top[x * 7 / width].y;
    		y_mem += stride;
    	}
    
    	for (; y < height * 7 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			y_mem[x] = colors_middle[x * 7 / width].y;
    		y_mem += stride;
    	}
    
    	for (; y < height; ++y) {
    		for (x = 0; x < width * 5 / 7; ++x)
    			y_mem[x] = colors_bottom[x * 4 / (width * 5 / 7)].y;
    		for (; x < width * 6 / 7; ++x)
    			y_mem[x] = colors_bottom[(x - width * 5 / 7) * 3
    						 / (width / 7) + 4].y;
    		for (; x < width; ++x)
    			y_mem[x] = colors_bottom[7].y;
    		y_mem += stride;
    	}
    
    	/* Chroma */
    	for (y = 0; y < height / ysub * 6 / 9; ++y) {
    		for (x = 0; x < width; x += xsub) {
    			u_mem[x*cs/xsub] = colors_top[x * 7 / width].u;
    			v_mem[x*cs/xsub] = colors_top[x * 7 / width].v;
    		}
    		u_mem += stride * cs / xsub;
    		v_mem += stride * cs / xsub;
    	}
    
    	for (; y < height / ysub * 7 / 9; ++y) {
    		for (x = 0; x < width; x += xsub) {
    			u_mem[x*cs/xsub] = colors_middle[x * 7 / width].u;
    			v_mem[x*cs/xsub] = colors_middle[x * 7 / width].v;
    		}
    		u_mem += stride * cs / xsub;
    		v_mem += stride * cs / xsub;
    	}
    
    	for (; y < height / ysub; ++y) {
    		for (x = 0; x < width * 5 / 7; x += xsub) {
    			u_mem[x*cs/xsub] =
    				colors_bottom[x * 4 / (width * 5 / 7)].u;
    			v_mem[x*cs/xsub] =
    				colors_bottom[x * 4 / (width * 5 / 7)].v;
    		}
    		for (; x < width * 6 / 7; x += xsub) {
    			u_mem[x*cs/xsub] = colors_bottom[(x - width * 5 / 7) *
    							 3 / (width / 7) + 4].u;
    			v_mem[x*cs/xsub] = colors_bottom[(x - width * 5 / 7) *
    							 3 / (width / 7) + 4].v;
    		}
    		for (; x < width; x += xsub) {
    			u_mem[x*cs/xsub] = colors_bottom[7].u;
    			v_mem[x*cs/xsub] = colors_bottom[7].v;
    		}
    		u_mem += stride * cs / xsub;
    		v_mem += stride * cs / xsub;
    	}
    }
    
    static void fill_smpte_yuv_packed(const struct util_yuv_info *yuv, void *mem,
    				  unsigned int width, unsigned int height,
    				  unsigned int stride)
    {
    	const struct color_yuv colors_top[] = {
    		MAKE_YUV_601(191, 192, 192),	/* grey */
    		MAKE_YUV_601(192, 192, 0),	/* yellow */
    		MAKE_YUV_601(0, 192, 192),	/* cyan */
    		MAKE_YUV_601(0, 192, 0),	/* green */
    		MAKE_YUV_601(192, 0, 192),	/* magenta */
    		MAKE_YUV_601(192, 0, 0),	/* red */
    		MAKE_YUV_601(0, 0, 192),	/* blue */
    	};
    	const struct color_yuv colors_middle[] = {
    		MAKE_YUV_601(0, 0, 192),	/* blue */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    		MAKE_YUV_601(192, 0, 192),	/* magenta */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    		MAKE_YUV_601(0, 192, 192),	/* cyan */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    		MAKE_YUV_601(192, 192, 192),	/* grey */
    	};
    	const struct color_yuv colors_bottom[] = {
    		MAKE_YUV_601(0, 33, 76),	/* in-phase */
    		MAKE_YUV_601(255, 255, 255),	/* super white */
    		MAKE_YUV_601(50, 0, 106),	/* quadrature */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    		MAKE_YUV_601(9, 9, 9),		/* 3.5% */
    		MAKE_YUV_601(19, 19, 19),	/* 7.5% */
    		MAKE_YUV_601(29, 29, 29),	/* 11.5% */
    		MAKE_YUV_601(19, 19, 19),	/* black */
    	};
    	unsigned char *y_mem = (yuv->order & YUV_YC) ? mem : mem + 1;
    	unsigned char *c_mem = (yuv->order & YUV_CY) ? mem : mem + 1;
    	unsigned int u = (yuv->order & YUV_YCrCb) ? 2 : 0;
    	unsigned int v = (yuv->order & YUV_YCbCr) ? 2 : 0;
    	unsigned int x;
    	unsigned int y;
    
    	/* Luma */
    	for (y = 0; y < height * 6 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			y_mem[2*x] = colors_top[x * 7 / width].y;
    		y_mem += stride;
    	}
    
    	for (; y < height * 7 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			y_mem[2*x] = colors_middle[x * 7 / width].y;
    		y_mem += stride;
    	}
    
    	for (; y < height; ++y) {
    		for (x = 0; x < width * 5 / 7; ++x)
    			y_mem[2*x] = colors_bottom[x * 4 / (width * 5 / 7)].y;
    		for (; x < width * 6 / 7; ++x)
    			y_mem[2*x] = colors_bottom[(x - width * 5 / 7) * 3
    						   / (width / 7) + 4].y;
    		for (; x < width; ++x)
    			y_mem[2*x] = colors_bottom[7].y;
    		y_mem += stride;
    	}
    
    	/* Chroma */
    	for (y = 0; y < height * 6 / 9; ++y) {
    		for (x = 0; x < width; x += 2) {
    			c_mem[2*x+u] = colors_top[x * 7 / width].u;
    			c_mem[2*x+v] = colors_top[x * 7 / width].v;
    		}
    		c_mem += stride;
    	}
    
    	for (; y < height * 7 / 9; ++y) {
    		for (x = 0; x < width; x += 2) {
    			c_mem[2*x+u] = colors_middle[x * 7 / width].u;
    			c_mem[2*x+v] = colors_middle[x * 7 / width].v;
    		}
    		c_mem += stride;
    	}
    
    	for (; y < height; ++y) {
    		for (x = 0; x < width * 5 / 7; x += 2) {
    			c_mem[2*x+u] = colors_bottom[x * 4 / (width * 5 / 7)].u;
    			c_mem[2*x+v] = colors_bottom[x * 4 / (width * 5 / 7)].v;
    		}
    		for (; x < width * 6 / 7; x += 2) {
    			c_mem[2*x+u] = colors_bottom[(x - width * 5 / 7) *
    						     3 / (width / 7) + 4].u;
    			c_mem[2*x+v] = colors_bottom[(x - width * 5 / 7) *
    						     3 / (width / 7) + 4].v;
    		}
    		for (; x < width; x += 2) {
    			c_mem[2*x+u] = colors_bottom[7].u;
    			c_mem[2*x+v] = colors_bottom[7].v;
    		}
    		c_mem += stride;
    	}
    }
    
    static void fill_smpte_rgb16(const struct util_rgb_info *rgb, void *mem,
    			     unsigned int width, unsigned int height,
    			     unsigned int stride)
    {
    	const uint16_t colors_top[] = {
    		MAKE_RGBA(rgb, 192, 192, 192, 255),	/* grey */
    		MAKE_RGBA(rgb, 192, 192, 0, 255),	/* yellow */
    		MAKE_RGBA(rgb, 0, 192, 192, 255),	/* cyan */
    		MAKE_RGBA(rgb, 0, 192, 0, 255),		/* green */
    		MAKE_RGBA(rgb, 192, 0, 192, 255),	/* magenta */
    		MAKE_RGBA(rgb, 192, 0, 0, 255),		/* red */
    		MAKE_RGBA(rgb, 0, 0, 192, 255),		/* blue */
    	};
    	const uint16_t colors_middle[] = {
    		MAKE_RGBA(rgb, 0, 0, 192, 127),		/* blue */
    		MAKE_RGBA(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA(rgb, 192, 0, 192, 127),	/* magenta */
    		MAKE_RGBA(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA(rgb, 0, 192, 192, 127),	/* cyan */
    		MAKE_RGBA(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA(rgb, 192, 192, 192, 127),	/* grey */
    	};
    	const uint16_t colors_bottom[] = {
    		MAKE_RGBA(rgb, 0, 33, 76, 255),		/* in-phase */
    		MAKE_RGBA(rgb, 255, 255, 255, 255),	/* super white */
    		MAKE_RGBA(rgb, 50, 0, 106, 255),	/* quadrature */
    		MAKE_RGBA(rgb, 19, 19, 19, 255),	/* black */
    		MAKE_RGBA(rgb, 9, 9, 9, 255),		/* 3.5% */
    		MAKE_RGBA(rgb, 19, 19, 19, 255),	/* 7.5% */
    		MAKE_RGBA(rgb, 29, 29, 29, 255),	/* 11.5% */
    		MAKE_RGBA(rgb, 19, 19, 19, 255),	/* black */
    	};
    	unsigned int x;
    	unsigned int y;
    
    	for (y = 0; y < height * 6 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((uint16_t *)mem)[x] = colors_top[x * 7 / width];
    		mem += stride;
    	}
    
    	for (; y < height * 7 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((uint16_t *)mem)[x] = colors_middle[x * 7 / width];
    		mem += stride;
    	}
    
    	for (; y < height; ++y) {
    		for (x = 0; x < width * 5 / 7; ++x)
    			((uint16_t *)mem)[x] =
    				colors_bottom[x * 4 / (width * 5 / 7)];
    		for (; x < width * 6 / 7; ++x)
    			((uint16_t *)mem)[x] =
    				colors_bottom[(x - width * 5 / 7) * 3
    					      / (width / 7) + 4];
    		for (; x < width; ++x)
    			((uint16_t *)mem)[x] = colors_bottom[7];
    		mem += stride;
    	}
    }
    
    static void fill_smpte_rgb24(const struct util_rgb_info *rgb, void *mem,
    			     unsigned int width, unsigned int height,
    			     unsigned int stride)
    {
    	const struct color_rgb24 colors_top[] = {
    		MAKE_RGB24(rgb, 192, 192, 192),	/* grey */
    		MAKE_RGB24(rgb, 192, 192, 0),	/* yellow */
    		MAKE_RGB24(rgb, 0, 192, 192),	/* cyan */
    		MAKE_RGB24(rgb, 0, 192, 0),	/* green */
    		MAKE_RGB24(rgb, 192, 0, 192),	/* magenta */
    		MAKE_RGB24(rgb, 192, 0, 0),	/* red */
    		MAKE_RGB24(rgb, 0, 0, 192),	/* blue */
    	};
    	const struct color_rgb24 colors_middle[] = {
    		MAKE_RGB24(rgb, 0, 0, 192),	/* blue */
    		MAKE_RGB24(rgb, 19, 19, 19),	/* black */
    		MAKE_RGB24(rgb, 192, 0, 192),	/* magenta */
    		MAKE_RGB24(rgb, 19, 19, 19),	/* black */
    		MAKE_RGB24(rgb, 0, 192, 192),	/* cyan */
    		MAKE_RGB24(rgb, 19, 19, 19),	/* black */
    		MAKE_RGB24(rgb, 192, 192, 192),	/* grey */
    	};
    	const struct color_rgb24 colors_bottom[] = {
    		MAKE_RGB24(rgb, 0, 33, 76),	/* in-phase */
    		MAKE_RGB24(rgb, 255, 255, 255),	/* super white */
    		MAKE_RGB24(rgb, 50, 0, 106),	/* quadrature */
    		MAKE_RGB24(rgb, 19, 19, 19),	/* black */
    		MAKE_RGB24(rgb, 9, 9, 9),	/* 3.5% */
    		MAKE_RGB24(rgb, 19, 19, 19),	/* 7.5% */
    		MAKE_RGB24(rgb, 29, 29, 29),	/* 11.5% */
    		MAKE_RGB24(rgb, 19, 19, 19),	/* black */
    	};
    	unsigned int x;
    	unsigned int y;
    
    	for (y = 0; y < height * 6 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((struct color_rgb24 *)mem)[x] =
    				colors_top[x * 7 / width];
    		mem += stride;
    	}
    
    	for (; y < height * 7 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((struct color_rgb24 *)mem)[x] =
    				colors_middle[x * 7 / width];
    		mem += stride;
    	}
    
    	for (; y < height; ++y) {
    		for (x = 0; x < width * 5 / 7; ++x)
    			((struct color_rgb24 *)mem)[x] =
    				colors_bottom[x * 4 / (width * 5 / 7)];
    		for (; x < width * 6 / 7; ++x)
    			((struct color_rgb24 *)mem)[x] =
    				colors_bottom[(x - width * 5 / 7) * 3
    					      / (width / 7) + 4];
    		for (; x < width; ++x)
    			((struct color_rgb24 *)mem)[x] = colors_bottom[7];
    		mem += stride;
    	}
    }
    
    static void fill_smpte_rgb32(const struct util_rgb_info *rgb, void *mem,
    			     unsigned int width, unsigned int height,
    			     unsigned int stride)
    {
    	const uint32_t colors_top[] = {
    		MAKE_RGBA(rgb, 192, 192, 192, 255),	/* grey */
    		MAKE_RGBA(rgb, 192, 192, 0, 255),	/* yellow */
    		MAKE_RGBA(rgb, 0, 192, 192, 255),	/* cyan */
    		MAKE_RGBA(rgb, 0, 192, 0, 255),		/* green */
    		MAKE_RGBA(rgb, 192, 0, 192, 255),	/* magenta */
    		MAKE_RGBA(rgb, 192, 0, 0, 255),		/* red */
    		MAKE_RGBA(rgb, 0, 0, 192, 255),		/* blue */
    	};
    	const uint32_t colors_middle[] = {
    		MAKE_RGBA(rgb, 0, 0, 192, 127),		/* blue */
    		MAKE_RGBA(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA(rgb, 192, 0, 192, 127),	/* magenta */
    		MAKE_RGBA(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA(rgb, 0, 192, 192, 127),	/* cyan */
    		MAKE_RGBA(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA(rgb, 192, 192, 192, 127),	/* grey */
    	};
    	const uint32_t colors_bottom[] = {
    		MAKE_RGBA(rgb, 0, 33, 76, 255),		/* in-phase */
    		MAKE_RGBA(rgb, 255, 255, 255, 255),	/* super white */
    		MAKE_RGBA(rgb, 50, 0, 106, 255),	/* quadrature */
    		MAKE_RGBA(rgb, 19, 19, 19, 255),	/* black */
    		MAKE_RGBA(rgb, 9, 9, 9, 255),		/* 3.5% */
    		MAKE_RGBA(rgb, 19, 19, 19, 255),	/* 7.5% */
    		MAKE_RGBA(rgb, 29, 29, 29, 255),	/* 11.5% */
    		MAKE_RGBA(rgb, 19, 19, 19, 255),	/* black */
    	};
    	unsigned int x;
    	unsigned int y;
    
    	for (y = 0; y < height * 6 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((uint32_t *)mem)[x] = colors_top[x * 7 / width];
    		mem += stride;
    	}
    
    	for (; y < height * 7 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((uint32_t *)mem)[x] = colors_middle[x * 7 / width];
    		mem += stride;
    	}
    
    	for (; y < height; ++y) {
    		for (x = 0; x < width * 5 / 7; ++x)
    			((uint32_t *)mem)[x] =
    				colors_bottom[x * 4 / (width * 5 / 7)];
    		for (; x < width * 6 / 7; ++x)
    			((uint32_t *)mem)[x] =
    				colors_bottom[(x - width * 5 / 7) * 3
    					      / (width / 7) + 4];
    		for (; x < width; ++x)
    			((uint32_t *)mem)[x] = colors_bottom[7];
    		mem += stride;
    	}
    }
    
    static void fill_smpte_rgb16fp(const struct util_rgb_info *rgb, void *mem,
    			       unsigned int width, unsigned int height,
    			       unsigned int stride)
    {
    	const uint64_t colors_top[] = {
    		MAKE_RGBA8FP16(rgb, 192, 192, 192, 255),/* grey */
    		MAKE_RGBA8FP16(rgb, 192, 192, 0, 255),	/* yellow */
    		MAKE_RGBA8FP16(rgb, 0, 192, 192, 255),	/* cyan */
    		MAKE_RGBA8FP16(rgb, 0, 192, 0, 255),	/* green */
    		MAKE_RGBA8FP16(rgb, 192, 0, 192, 255),	/* magenta */
    		MAKE_RGBA8FP16(rgb, 192, 0, 0, 255),	/* red */
    		MAKE_RGBA8FP16(rgb, 0, 0, 192, 255),	/* blue */
    	};
    	const uint64_t colors_middle[] = {
    		MAKE_RGBA8FP16(rgb, 0, 0, 192, 127),	/* blue */
    		MAKE_RGBA8FP16(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA8FP16(rgb, 192, 0, 192, 127),	/* magenta */
    		MAKE_RGBA8FP16(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA8FP16(rgb, 0, 192, 192, 127),	/* cyan */
    		MAKE_RGBA8FP16(rgb, 19, 19, 19, 127),	/* black */
    		MAKE_RGBA8FP16(rgb, 192, 192, 192, 127),/* grey */
    	};
    	const uint64_t colors_bottom[] = {
    		MAKE_RGBA8FP16(rgb, 0, 33, 76, 255),	/* in-phase */
    		MAKE_RGBA8FP16(rgb, 255, 255, 255, 255),/* super white */
    		MAKE_RGBA8FP16(rgb, 50, 0, 106, 255),	/* quadrature */
    		MAKE_RGBA8FP16(rgb, 19, 19, 19, 255),	/* black */
    		MAKE_RGBA8FP16(rgb, 9, 9, 9, 255),	/* 3.5% */
    		MAKE_RGBA8FP16(rgb, 19, 19, 19, 255),	/* 7.5% */
    		MAKE_RGBA8FP16(rgb, 29, 29, 29, 255),	/* 11.5% */
    		MAKE_RGBA8FP16(rgb, 19, 19, 19, 255),	/* black */
    	};
    	unsigned int x;
    	unsigned int y;
    
    	for (y = 0; y < height * 6 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((uint64_t *)mem)[x] = colors_top[x * 7 / width];
    		mem += stride;
    	}
    
    	for (; y < height * 7 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((uint64_t *)mem)[x] = colors_middle[x * 7 / width];
    		mem += stride;
    	}
    
    	for (; y < height; ++y) {
    		for (x = 0; x < width * 5 / 7; ++x)
    			((uint64_t *)mem)[x] =
    				colors_bottom[x * 4 / (width * 5 / 7)];
    		for (; x < width * 6 / 7; ++x)
    			((uint64_t *)mem)[x] =
    				colors_bottom[(x - width * 5 / 7) * 3
    					      / (width / 7) + 4];
    		for (; x < width; ++x)
    			((uint64_t *)mem)[x] = colors_bottom[7];
    		mem += stride;
    	}
    }
    
    static void fill_smpte_c8(void *mem, unsigned int width, unsigned int height,
    			  unsigned int stride)
    {
    	unsigned int x;
    	unsigned int y;
    
    	for (y = 0; y < height * 6 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((uint8_t *)mem)[x] = x * 7 / width;
    		mem += stride;
    	}
    
    	for (; y < height * 7 / 9; ++y) {
    		for (x = 0; x < width; ++x)
    			((uint8_t *)mem)[x] = 7 + (x * 7 / width);
    		mem += stride;
    	}
    
    	for (; y < height; ++y) {
    		for (x = 0; x < width * 5 / 7; ++x)
    			((uint8_t *)mem)[x] =
    				14 + (x * 4 / (width * 5 / 7));
    		for (; x < width * 6 / 7; ++x)
    			((uint8_t *)mem)[x] =
    				14 + ((x - width * 5 / 7) * 3
    					      / (width / 7) + 4);
    		for (; x < width; ++x)
    			((uint8_t *)mem)[x] = 14 + 7;
    		mem += stride;
    	}
    }
    
    void util_smpte_c8_gamma(unsigned size, struct drm_color_lut *lut)
    {
    	if (size < 7 + 7 + 8) {
    		printf("Error: gamma too small: %d < %d\n", size, 7 + 7 + 8);
    		return;
    	}
    	memset(lut, 0, size * sizeof(struct drm_color_lut));
    
    #define FILL_COLOR(idx, r, g, b) \
    	lut[idx].red = (r) << 8; \
    	lut[idx].green = (g) << 8; \
    	lut[idx].blue = (b) << 8
    
    	FILL_COLOR( 0, 192, 192, 192);	/* grey */
    	FILL_COLOR( 1, 192, 192, 0  );	/* yellow */
    	FILL_COLOR( 2, 0,   192, 192);	/* cyan */
    	FILL_COLOR( 3, 0,   192, 0  );	/* green */
    	FILL_COLOR( 4, 192, 0,   192);	/* magenta */
    	FILL_COLOR( 5, 192, 0,   0  );	/* red */
    	FILL_COLOR( 6, 0,   0,   192);	/* blue */
    
    	FILL_COLOR( 7, 0,   0,   192);	/* blue */
    	FILL_COLOR( 8, 19,  19,  19 );	/* black */
    	FILL_COLOR( 9, 192, 0,   192);	/* magenta */
    	FILL_COLOR(10, 19,  19,  19 );	/* black */
    	FILL_COLOR(11, 0,   192, 192);	/* cyan */
    	FILL_COLOR(12, 19,  19,  19 );	/* black */
    	FILL_COLOR(13, 192, 192, 192);	/* grey */
    
    	FILL_COLOR(14, 0,   33,  76);	/* in-phase */
    	FILL_COLOR(15, 255, 255, 255);	/* super white */
    	FILL_COLOR(16, 50,  0,   106);	/* quadrature */
    	FILL_COLOR(17, 19,  19,  19);	/* black */
    	FILL_COLOR(18, 9,   9,   9);	/* 3.5% */
    	FILL_COLOR(19, 19,  19,  19);	/* 7.5% */
    	FILL_COLOR(20, 29,  29,  29);	/* 11.5% */
    	FILL_COLOR(21, 19,  19,  19);	/* black */
    
    #undef FILL_COLOR
    }
    
    static void fill_smpte(const struct util_format_info *info, void *planes[3],
    		       unsigned int width, unsigned int height,
    		       unsigned int stride)
    {
    	unsigned char *u, *v;
    
    	switch (info->format) {
    	case DRM_FORMAT_C8:
    		return fill_smpte_c8(planes[0], width, height, stride);
    	case DRM_FORMAT_UYVY:
    	case DRM_FORMAT_VYUY:
    	case DRM_FORMAT_YUYV:
    	case DRM_FORMAT_YVYU:
    		return fill_smpte_yuv_packed(&info->yuv, planes[0], width,
    					     height, stride);
    
    	case DRM_FORMAT_NV12:
    	case DRM_FORMAT_NV21:
    	case DRM_FORMAT_NV16:
    	case DRM_FORMAT_NV61:
    		u = info->yuv.order & YUV_YCbCr ? planes[1] : planes[1] + 1;
    		v = info->yuv.order & YUV_YCrCb ? planes[1] : planes[1] + 1;
    		return fill_smpte_yuv_planar(&info->yuv, planes[0], u, v,
    					     width, height, stride);
    
    	case DRM_FORMAT_YUV420:
    		return fill_smpte_yuv_planar(&info->yuv, planes[0], planes[1],
    					     planes[2], width, height, stride);
    
    	case DRM_FORMAT_YVU420:
    		return fill_smpte_yuv_planar(&info->yuv, planes[0], planes[2],
    					     planes[1], width, height, stride);
    
    	case DRM_FORMAT_ARGB4444:
    	case DRM_FORMAT_XRGB4444:
    	case DRM_FORMAT_ABGR4444:
    	case DRM_FORMAT_XBGR4444:
    	case DRM_FORMAT_RGBA4444:
    	case DRM_FORMAT_RGBX4444:
    	case DRM_FORMAT_BGRA4444:
    	case DRM_FORMAT_BGRX4444:
    	case DRM_FORMAT_RGB565:
    	case DRM_FORMAT_BGR565:
    	case DRM_FORMAT_ARGB1555:
    	case DRM_FORMAT_XRGB1555:
    	case DRM_FORMAT_ABGR1555:
    	case DRM_FORMAT_XBGR1555:
    	case DRM_FORMAT_RGBA5551:
    	case DRM_FORMAT_RGBX5551:
    	case DRM_FORMAT_BGRA5551:
    	case DRM_FORMAT_BGRX5551:
    		return fill_smpte_rgb16(&info->rgb, planes[0],
    					width, height, stride);
    
    	case DRM_FORMAT_BGR888:
    	case DRM_FORMAT_RGB888:
    		return fill_smpte_rgb24(&info->rgb, planes[0],
    					width, height, stride);
    	case DRM_FORMAT_ARGB8888:
    	case DRM_FORMAT_XRGB8888:
    	case DRM_FORMAT_ABGR8888:
    	case DRM_FORMAT_XBGR8888:
    	case DRM_FORMAT_RGBA8888:
    	case DRM_FORMAT_RGBX8888:
    	case DRM_FORMAT_BGRA8888:
    	case DRM_FORMAT_BGRX8888:
    	case DRM_FORMAT_ARGB2101010:
    	case DRM_FORMAT_XRGB2101010:
    	case DRM_FORMAT_ABGR2101010:
    	case DRM_FORMAT_XBGR2101010:
    	case DRM_FORMAT_RGBA1010102:
    	case DRM_FORMAT_RGBX1010102:
    	case DRM_FORMAT_BGRA1010102:
    	case DRM_FORMAT_BGRX1010102:
    		return fill_smpte_rgb32(&info->rgb, planes[0],
    					width, height, stride);
    
    	case DRM_FORMAT_XRGB16161616F:
    	case DRM_FORMAT_XBGR16161616F:
    	case DRM_FORMAT_ARGB16161616F:
    	case DRM_FORMAT_ABGR16161616F:
    		return fill_smpte_rgb16fp(&info->rgb, planes[0],
    					  width, height, stride);
    	}
    }
    
    /* swap these for big endian.. */
    #define RED   2
    #define GREEN 1
    #define BLUE  0
    
    static void make_pwetty(void *data, unsigned int width, unsigned int height,
    			unsigned int stride, uint32_t format)
    {
    #if HAVE_CAIRO
    	cairo_surface_t *surface;
    	cairo_t *cr;
    	cairo_format_t cairo_format;
    
    	/* we can ignore the order of R,G,B channels */
    	switch (format) {
    	case DRM_FORMAT_XRGB8888:
    	case DRM_FORMAT_ARGB8888:
    	case DRM_FORMAT_XBGR8888:
    	case DRM_FORMAT_ABGR8888:
    		cairo_format = CAIRO_FORMAT_ARGB32;
    		break;
    	case DRM_FORMAT_RGB565:
    	case DRM_FORMAT_BGR565:
    		cairo_format = CAIRO_FORMAT_RGB16_565;
    		break;
    #if CAIRO_VERSION_MAJOR > 1 || (CAIRO_VERSION_MAJOR == 1 && CAIRO_VERSION_MINOR >= 12)
    	case DRM_FORMAT_ARGB2101010:
    	case DRM_FORMAT_XRGB2101010:
    	case DRM_FORMAT_ABGR2101010:
    	case DRM_FORMAT_XBGR2101010:
    		cairo_format = CAIRO_FORMAT_RGB30;
    		break;
    #endif
    	default:
    		return;
    	}
    
    	surface = cairo_image_surface_create_for_data(data,
    						      cairo_format,
    						      width, height,
    						      stride);
    	cr = cairo_create(surface);
    	cairo_surface_destroy(surface);
    
    	cairo_set_line_cap(cr, CAIRO_LINE_CAP_SQUARE);
    	for (unsigned x = 0; x < width; x += 250)
    		for (unsigned y = 0; y < height; y += 250) {
    			char buf[64];
    
    			cairo_move_to(cr, x, y - 20);
    			cairo_line_to(cr, x, y + 20);
    			cairo_move_to(cr, x - 20, y);
    			cairo_line_to(cr, x + 20, y);
    			cairo_new_sub_path(cr);
    			cairo_arc(cr, x, y, 10, 0, M_PI * 2);
    			cairo_set_line_width(cr, 4);
    			cairo_set_source_rgb(cr, 0, 0, 0);
    			cairo_stroke_preserve(cr);
    			cairo_set_source_rgb(cr, 1, 1, 1);
    			cairo_set_line_width(cr, 2);
    			cairo_stroke(cr);
    
    			snprintf(buf, sizeof buf, "%d, %d", x, y);
    			cairo_move_to(cr, x + 20, y + 20);
    			cairo_text_path(cr, buf);
    			cairo_set_source_rgb(cr, 0, 0, 0);
    			cairo_stroke_preserve(cr);
    			cairo_set_source_rgb(cr, 1, 1, 1);
    			cairo_fill(cr);
    		}
    
    	cairo_destroy(cr);
    #endif
    }
    
    static void fill_tiles_yuv_planar(const struct util_format_info *info,
    				  unsigned char *y_mem, unsigned char *u_mem,
    				  unsigned char *v_mem, unsigned int width,
    				  unsigned int height, unsigned int stride)
    {
    	const struct util_yuv_info *yuv = &info->yuv;
    	unsigned int cs = yuv->chroma_stride;
    	unsigned int xsub = yuv->xsub;
    	unsigned int ysub = yuv->ysub;
    	unsigned int x;
    	unsigned int y;
    
    	for (y = 0; y < height; ++y) {
    		for (x = 0; x < width; ++x) {
    			div_t d = div(x+y, width);
    			uint32_t rgb32 = 0x00130502 * (d.quot >> 6)
    				       + 0x000a1120 * (d.rem >> 6);
    			struct color_yuv color =
    				MAKE_YUV_601((rgb32 >> 16) & 0xff,
    					     (rgb32 >> 8) & 0xff, rgb32 & 0xff);
    
    			y_mem[x] = color.y;
    			u_mem[x/xsub*cs] = color.u;
    			v_mem[x/xsub*cs] = color.v;
    		}
    
    		y_mem += stride;
    		if ((y + 1) % ysub == 0) {
    			u_mem += stride * cs / xsub;
    			v_mem += stride * cs / xsub;
    		}
    	}
    }
    
    static void fill_tiles_yuv_packed(const struct util_format_info *info,
    				  void *mem, unsigned int width,
    				  unsigned int height, unsigned int stride)
    {
    	const struct util_yuv_info *yuv = &info->yuv;
    	unsigned char *y_mem = (yuv->order & YUV_YC) ? mem : mem + 1;
    	unsigned char *c_mem = (yuv->order & YUV_CY) ? mem : mem + 1;
    	unsigned int u = (yuv->order & YUV_YCrCb) ? 2 : 0;
    	unsigned int v = (yuv->order & YUV_YCbCr) ? 2 : 0;
    	unsigned int x;
    	unsigned int y;
    
    	for (y = 0; y < height; ++y) {
    		for (x = 0; x < width; x += 2) {
    			div_t d = div(x+y, width);
    			uint32_t rgb32 = 0x00130502 * (d.quot >> 6)
    				       + 0x000a1120 * (d.rem >> 6);
    			struct color_yuv color =
    				MAKE_YUV_601((rgb32 >> 16) & 0xff,
    					     (rgb32 >> 8) & 0xff, rgb32 & 0xff);
    
    			y_mem[2*x] = color.y;
    			c_mem[2*x+u] = color.u;
    			y_mem[2*x+2] = color.y;
    			c_mem[2*x+v] = color.v;
    		}
    
    		y_mem += stride;
    		c_mem += stride;
    	}
    }
    
    static void fill_tiles_rgb16(const struct util_format_info *info, void *mem,
    			     unsigned int width, unsigned int height,
    			     unsigned int stride)
    {
    	const struct util_rgb_info *rgb = &info->rgb;
    	void *mem_base = mem;
    	unsigned int x, y;
    
    	for (y = 0; y < height; ++y) {
    		for (x = 0; x < width; ++x) {
    			div_t d = div(x+y, width);
    			uint32_t rgb32 = 0x00130502 * (d.quot >> 6)
    				       + 0x000a1120 * (d.rem >> 6);
    			uint16_t color =
    				MAKE_RGBA(rgb, (rgb32 >> 16) & 0xff,
    					  (rgb32 >> 8) & 0xff, rgb32 & 0xff,
    					  255);
    
    			((uint16_t *)mem)[x] = color;
    		}
    		mem += stride;
    	}
    
    	make_pwetty(mem_base, width, height, stride, info->format);
    }
    
    static void fill_tiles_rgb24(const struct util_format_info *info, void *mem,
    			     unsigned int width, unsigned int height,
    			     unsigned int stride)
    {
    	const struct util_rgb_info *rgb = &info->rgb;
    	unsigned int x, y;
    
    	for (y = 0; y < height; ++y) {
    		for (x = 0; x < width; ++x) {
    			div_t d = div(x+y, width);
    			uint32_t rgb32 = 0x00130502 * (d.quot >> 6)
    				       + 0x000a1120 * (d.rem >> 6);
    			struct color_rgb24 color =
    				MAKE_RGB24(rgb, (rgb32 >> 16) & 0xff,
    					   (rgb32 >> 8) & 0xff, rgb32 & 0xff);
    
    			((struct color_rgb24 *)mem)[x] = color;
    		}
    		mem += stride;
    	}
    }
    
    static void fill_tiles_rgb32(const struct util_format_info *info, void *mem,
    			     unsigned int width, unsigned int height,
    			     unsigned int stride)
    {
    	const struct util_rgb_info *rgb = &info->rgb;
    	void *mem_base = mem;
    	unsigned int x, y;
    
    	for (y = 0; y < height; ++y) {
    		for (x = 0; x < width; ++x) {
    			div_t d = div(x+y, width);
    			uint32_t rgb32 = 0x00130502 * (d.quot >> 6)
    				       + 0x000a1120 * (d.rem >> 6);
    			uint32_t alpha = ((y < height/2) && (x < width/2)) ? 127 : 255;
    			uint32_t color =
    				MAKE_RGBA(rgb, (rgb32 >> 16) & 0xff,
    					  (rgb32 >> 8) & 0xff, rgb32 & 0xff,
    					  alpha);
    
    			((uint32_t *)mem)[x] = color;
    		}
    		mem += stride;
    	}
    
    	make_pwetty(mem_base, width, height, stride, info->format);
    }
    
    static void fill_tiles_rgb16fp(const struct util_format_info *info, void *mem,
    			       unsigned int width, unsigned int height,
    			       unsigned int stride)
    {
    	const struct util_rgb_info *rgb = &info->rgb;
    	unsigned int x, y;
    
    	/* TODO: Give this actual fp16 precision */
    	for (y = 0; y < height; ++y) {
    		for (x = 0; x < width; ++x) {
    			div_t d = div(x+y, width);
    			uint32_t rgb32 = 0x00130502 * (d.quot >> 6)
    				       + 0x000a1120 * (d.rem >> 6);
    			uint32_t alpha = ((y < height/2) && (x < width/2)) ? 127 : 255;
    			uint64_t color =
    				MAKE_RGBA8FP16(rgb, (rgb32 >> 16) & 0xff,
    					       (rgb32 >> 8) & 0xff, rgb32 & 0xff,
    					       alpha);
    
    			((uint64_t *)mem)[x] = color;
    		}
    		mem += stride;
    	}
    }
    
    static void fill_tiles(const struct util_format_info *info, void *planes[3],
    		       unsigned int width, unsigned int height,
    		       unsigned int stride)
    {
    	unsigned char *u, *v;
    
    	switch (info->format) {
    	case DRM_FORMAT_UYVY:
    	case DRM_FORMAT_VYUY:
    	case DRM_FORMAT_YUYV:
    	case DRM_FORMAT_YVYU:
    		return fill_tiles_yuv_packed(info, planes[0],
    					     width, height, stride);
    
    	case DRM_FORMAT_NV12:
    	case DRM_FORMAT_NV21:
    	case DRM_FORMAT_NV16:
    	case DRM_FORMAT_NV61:
    		u = info->yuv.order & YUV_YCbCr ? planes[1] : planes[1] + 1;
    		v = info->yuv.order & YUV_YCrCb ? planes[1] : planes[1] + 1;
    		return fill_tiles_yuv_planar(info, planes[0], u, v,
    					     width, height, stride);
    
    	case DRM_FORMAT_YUV420:
    		return fill_tiles_yuv_planar(info, planes[0], planes[1],
    					     planes[2], width, height, stride);
    
    	case DRM_FORMAT_YVU420:
    		return fill_tiles_yuv_planar(info, planes[0], planes[2],
    					     planes[1], width, height, stride);
    
    	case DRM_FORMAT_ARGB4444:
    	case DRM_FORMAT_XRGB4444:
    	case DRM_FORMAT_ABGR4444:
    	case DRM_FORMAT_XBGR4444:
    	case DRM_FORMAT_RGBA4444:
    	case DRM_FORMAT_RGBX4444:
    	case DRM_FORMAT_BGRA4444:
    	case DRM_FORMAT_BGRX4444:
    	case DRM_FORMAT_RGB565:
    	case DRM_FORMAT_BGR565:
    	case DRM_FORMAT_ARGB1555:
    	case DRM_FORMAT_XRGB1555:
    	case DRM_FORMAT_ABGR1555:
    	case DRM_FORMAT_XBGR1555:
    	case DRM_FORMAT_RGBA5551:
    	case DRM_FORMAT_RGBX5551:
    	case DRM_FORMAT_BGRA5551:
    	case DRM_FORMAT_BGRX5551:
    		return fill_tiles_rgb16(info, planes[0],
    					width, height, stride);
    
    	case DRM_FORMAT_BGR888:
    	case DRM_FORMAT_RGB888:
    		return fill_tiles_rgb24(info, planes[0],
    					width, height, stride);
    	case DRM_FORMAT_ARGB8888:
    	case DRM_FORMAT_XRGB8888:
    	case DRM_FORMAT_ABGR8888:
    	case DRM_FORMAT_XBGR8888:
    	case DRM_FORMAT_RGBA8888:
    	case DRM_FORMAT_RGBX8888:
    	case DRM_FORMAT_BGRA8888:
    	case DRM_FORMAT_BGRX8888:
    	case DRM_FORMAT_ARGB2101010:
    	case DRM_FORMAT_XRGB2101010:
    	case DRM_FORMAT_ABGR2101010:
    	case DRM_FORMAT_XBGR2101010:
    	case DRM_FORMAT_RGBA1010102:
    	case DRM_FORMAT_RGBX1010102:
    	case DRM_FORMAT_BGRA1010102:
    	case DRM_FORMAT_BGRX1010102:
    		return fill_tiles_rgb32(info, planes[0],
    					width, height, stride);
    
    	case DRM_FORMAT_XRGB16161616F:
    	case DRM_FORMAT_XBGR16161616F:
    	case DRM_FORMAT_ARGB16161616F:
    	case DRM_FORMAT_ABGR16161616F:
    		return fill_tiles_rgb16fp(info, planes[0],
    					  width, height, stride);
    	}
    }
    
    static void fill_plain(const struct util_format_info *info, void *planes[3],
    		       unsigned int height,
    		       unsigned int stride)
    {
    	switch (info->format) {
    	case DRM_FORMAT_XRGB16161616F:
    	case DRM_FORMAT_XBGR16161616F:
    	case DRM_FORMAT_ARGB16161616F:
    	case DRM_FORMAT_ABGR16161616F:
    		/* 0x3838 = 0.5273 */
    		memset(planes[0], 0x38, stride * height);
    		break;
    	default:
    		memset(planes[0], 0x77, stride * height);
    		break;
    	}
    }
    
    static void fill_gradient_rgb32(const struct util_rgb_info *rgb,
    				void *mem,
    				unsigned int width, unsigned int height,
    				unsigned int stride)
    {
    	unsigned int i, j;
    
    	for (i = 0; i < height / 2; i++) {
    		uint32_t *row = mem;
    
    		for (j = 0; j < width / 2; j++) {
    			uint32_t value = MAKE_RGBA10(rgb, j & 0x3ff, j & 0x3ff, j & 0x3ff, 0);
    			row[2*j] = row[2*j+1] = value;
    		}
    		mem += stride;
    	}
    
    	for (; i < height; i++) {
    		uint32_t *row = mem;
    
    		for (j = 0; j < width / 2; j++) {
    			uint32_t value = MAKE_RGBA10(rgb, j & 0x3fc, j & 0x3fc, j & 0x3fc, 0);
    			row[2*j] = row[2*j+1] = value;
    		}
    		mem += stride;
    	}
    }
    
    static void fill_gradient_rgb16fp(const struct util_rgb_info *rgb,
    				  void *mem,
    				  unsigned int width, unsigned int height,
    				  unsigned int stride)
    {
    	unsigned int i, j;
    
    	for (i = 0; i < height / 2; i++) {
    		uint64_t *row = mem;
    
    		for (j = 0; j < width / 2; j++) {
    			uint64_t value = MAKE_RGBA10FP16(rgb, j & 0x3ff, j & 0x3ff, j & 0x3ff, 0);
    			row[2*j] = row[2*j+1] = value;
    		}
    		mem += stride;
    	}
    
    	for (; i < height; i++) {
    		uint64_t *row = mem;
    
    		for (j = 0; j < width / 2; j++) {
    			uint64_t value = MAKE_RGBA10FP16(rgb, j & 0x3fc, j & 0x3fc, j & 0x3fc, 0);
    			row[2*j] = row[2*j+1] = value;
    		}
    		mem += stride;
    	}
    }
    
    /* The gradient pattern creates two horizontal gray gradients, split
     * into two halves. The top half has 10bpc precision, the bottom half
     * has 8bpc precision. When using with a 10bpc fb format, there are 3
     * possible outcomes:
     *
     *  - Pixel data is encoded as 8bpc to the display, no dithering. This
     *    would lead to the top and bottom halves looking identical.
     *
     *  - Pixel data is encoded as 8bpc to the display, with dithering. This
     *    would lead to there being a visible difference between the two halves,
     *    but the top half would look a little speck-y due to the dithering.
     *
     *  - Pixel data is encoded at 10bpc+ to the display (which implies
     *    the display is able to show this level of depth). This should
     *    lead to the top half being a very clean gradient, and visibly different
     *    from the bottom half.
     *
     * Once we support additional fb formats, this approach could be extended
     * to distinguish even higher bpc precisions.
     *
     * Note that due to practical size considerations, for the screens
     * where this matters, the pattern actually emits stripes 2-pixels
     * wide for each gradient color. Otherwise the difference may be a bit
     * hard to notice.
     */
    static void fill_gradient(const struct util_format_info *info, void *planes[3],
    			  unsigned int width, unsigned int height,
    			  unsigned int stride)
    {
    	switch (info->format) {
    	case DRM_FORMAT_ARGB8888:
    	case DRM_FORMAT_XRGB8888:
    	case DRM_FORMAT_ABGR8888:
    	case DRM_FORMAT_XBGR8888:
    	case DRM_FORMAT_RGBA8888:
    	case DRM_FORMAT_RGBX8888:
    	case DRM_FORMAT_BGRA8888:
    	case DRM_FORMAT_BGRX8888:
    	case DRM_FORMAT_ARGB2101010:
    	case DRM_FORMAT_XRGB2101010:
    	case DRM_FORMAT_ABGR2101010:
    	case DRM_FORMAT_XBGR2101010:
    	case DRM_FORMAT_RGBA1010102:
    	case DRM_FORMAT_RGBX1010102:
    	case DRM_FORMAT_BGRA1010102:
    	case DRM_FORMAT_BGRX1010102:
    		return fill_gradient_rgb32(&info->rgb, planes[0],
    					   width, height, stride);
    
    	case DRM_FORMAT_XRGB16161616F:
    	case DRM_FORMAT_XBGR16161616F:
    	case DRM_FORMAT_ARGB16161616F:
    	case DRM_FORMAT_ABGR16161616F:
    		return fill_gradient_rgb16fp(&info->rgb, planes[0],
    					     width, height, stride);
    	}
    }
    
    /*
     * util_fill_pattern - Fill a buffer with a test pattern
     * @format: Pixel format
     * @pattern: Test pattern
     * @planes: Array of buffers
     * @width: Width in pixels
     * @height: Height in pixels
     * @stride: Line stride (pitch) in bytes
     *
     * Fill the buffers with the test pattern specified by the pattern parameter.
     * Supported formats vary depending on the selected pattern.
     */
    void util_fill_pattern(uint32_t format, enum util_fill_pattern pattern,
    		       void *planes[3], unsigned int width,
    		       unsigned int height, unsigned int stride)
    {
    	const struct util_format_info *info;
    
    	info = util_format_info_find(format);
    	if (info == NULL)
    		return;
    
    	switch (pattern) {
    	case UTIL_PATTERN_TILES:
    		return fill_tiles(info, planes, width, height, stride);
    
    	case UTIL_PATTERN_SMPTE:
    		return fill_smpte(info, planes, width, height, stride);
    
    	case UTIL_PATTERN_PLAIN:
    		return fill_plain(info, planes, height, stride);
    
    	case UTIL_PATTERN_GRADIENT:
    		return fill_gradient(info, planes, width, height, stride);
    
    	default:
    		printf("Error: unsupported test pattern %u.\n", pattern);
    		break;
    	}
    }
    
    static const char *pattern_names[] = {
    	[UTIL_PATTERN_TILES] = "tiles",
    	[UTIL_PATTERN_SMPTE] = "smpte",
    	[UTIL_PATTERN_PLAIN] = "plain",
    	[UTIL_PATTERN_GRADIENT] = "gradient",
    };
    
    enum util_fill_pattern util_pattern_enum(const char *name)
    {
    	unsigned int i;
    
    	for (i = 0; i < ARRAY_SIZE(pattern_names); i++)
    		if (!strcmp(pattern_names[i], name))
    			return (enum util_fill_pattern)i;
    
    	printf("Error: unsupported test pattern %s.\n", name);
    	return UTIL_PATTERN_SMPTE;
    }